一、问题提出
mybatis是根据mapper.xml文件动态生成mapper接口的实现类，按照Spring的常规组件扫描的方式不能添加到IOC容器中，需要做出相应的配置
二、解决方案
图片摘自尚硅谷尚筹网项目文档。
如图可知，需要在Spring和mybatis整合的配置文件中配置
- 启动Spring组件扫描
- 数据源
- SqlsessionFactoryBean
- MapperScannerConfigurer
三、MyBatis逆向工程
pom文件
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
</dependencies>
<!-- 控制maven在构建过程中的配置 -->
<build>
<!--构建过程中用到的插件-->
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.4.1</version>
<!--插件用的依赖-->
<dependencies>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.4.1</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.25</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
generatorConfig.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--mybatis generator:generate -->
<context id="wdhTables" targetRuntime="MyBatis3">
<commentGenerator>
<!--是否去除自动生成的注释 true:是 ;false:否 -->
<property name="suppressAllComments" value="ture" />
</commentGenerator>
<!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
<jdbcConnection
driverClass="com.mysql.cj.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/mbook"
userId="root"
password="123456">
</jdbcConnection>
<!--
默认 false，把 JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把
JDBC DECIMAL
和 NUMERIC 类型解析为 java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!--targetProject:生成 Entity类的路径 -->
<javaModelGenerator targetProject=".\src\main\java"
targetPackage="com.wdh.entity">
<!--enableSubPackages:是否让 schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
<!--从数据库返回的值被清理前后的空格 -->
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!--targetProject:XxxMapper.xml映射文件生成的路径 -->
<sqlMapGenerator targetProject=".\src\main\java"
targetPackage="com.wdh.mapper">
<!--enableSubPackages:是否让 schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<!--targetPackage Mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER"
targetProject=".\src\main\java"
targetPackage="com.wdh.mapper">
<!--enableSubPackages:是否让 schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<!-- 数据库表名字和我们的 entity类对应的映射指定 -->
<table tableName="login" domainObjectName="Login" />
</context>
</generatorConfiguration>
生成结果：
把生成的文件移动到对应的工程文件中
四、Spring与mybatis的配置文件
主模块依赖jar包
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.3.16</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.16</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.25</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.8</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.7</version>
</dependency>
</dependencies>
spring-persist-mybatis.xml
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!--启动组件扫描--> <context:component-scan base-package="com.wdh"/> <!--引用jdbc.properties文件--> <context:property-placeholder location="classpath:jdbc.properties"/> <!--配置druid数据源--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <property name="url" value="${jdbc.url}"/> <!--注意这里是dirverClassName--> <property name="driverClassName" value="${jdbc.driver}"/> </bean> <!--配置SqlSessionFactoryBean--> <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--配置数据源--> <property name="dataSource" ref="dataSource"/> <!--配置mybatis-config文件位置--> <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/> <!--配置mapper映射文件位置--> <property name="mapperLocations" value="classpath:mybatis/mapper/*Mapper.xml"/> </bean> <!--配置MapperScannerConfigurer--> <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--配置要扫描的包--> <property name="basePackage" value="com.wdh.mapper"/> </bean></beans><?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--启动组件扫描-->
<context:component-scan base-package="com.wdh"/>
<!--引用jdbc.properties文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--配置druid数据源-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="url" value="${jdbc.url}"/>
<!--注意这里是dirverClassName-->
<property name="driverClassName" value="${jdbc.driver}"/>
</bean>
<!--配置SqlSessionFactoryBean-->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--配置数据源-->
<property name="dataSource" ref="dataSource"/>
<!--配置mybatis-config文件位置-->
<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
<!--配置mapper映射文件位置-->
<property name="mapperLocations" value="classpath:mybatis/mapper/*Mapper.xml"/>
</bean>
<!--配置MapperScannerConfigurer-->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--配置要扫描的包-->
<property name="basePackage" value="com.wdh.mapper"/>
</bean>
</beans>
文件目录
五、测试
//junit与Spring整合
@RunWith(SpringJUnit4ClassRunner.class)
//加载Spring配置文件
@ContextConfiguration(locations = {"classpath:spring-persist-mybatis.xml"})
public class DataSourceTest {
@Autowired
private DataSource dataSource;
@Autowired
private LoginMapper loginMapper;
@Test
public void connTest() throws SQLException {
System.out.println(dataSource.getConnection());
}
@Test
public void insertTest(){
Login login = new Login(2, "wdh", "123", false);
int i = loginMapper.insert(login);
System.out.println("受影响的行数："+ i);
}
}
结果：
六、总结
总结
本篇文章就到这里了，希望能够给你带来帮助，也希望您能够多多关注服务器之家的更多内容!
原文链接：https://blog.csdn.net/m0_55659236/article/details/123526117
